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    <section class="intro" id="zen-intro">
        <header role="banner"                <!--SF-- role 是什么新属性？banner又是什么意思呢？-->
        <!--解释下header的位置：
            header是absolute定位，期中left指定为0px，然而top没有指定
            这种情况下，权威指南指出上边距是以父元素的上边界-->
        <!--<h1>CSS Zen Garden</h1>-->
        <img src="/static/ZenCss/036/centerpiece.jpg"/>
        <h2>The Beauty of <abbr title="Cascading Style Sheets">CSS</abbr> Design</h2>
        <!--SF-- abbr 标签是什么意思呢？ -->
        </header>
        <div class="summary" id="zen-summary" role="article">
            <!--transparent   表示透明无颜色，是background-color 的默认值
                所以p元素加了内边距之后，仍然能够看到后面的summary绿色的背景图-->
            <p>A demonstration of what can be accomplished through <abbr title="Cascading Style Sheets">CSS</abbr>-based
                design. Select any style sheet from the list to load it into this page.</p>
            <p>Download the example <a href="/examples/index" title="This page's source HTML code, not to be modified.">html
                file</a> and <a href="/examples/style.css" title="This page's sample CSS, the file you may modify.">css
                file</a></p>
        </div>
        <div class="preamble" id="zen-preamble" role="article">
            <h3>The Road to Enlightenment</h3>
            <p>Littering a dark and dreary road lay the past relics of browser-specific tags, incompatible <abbr
                    title="Document Object Model">DOM</abbr>s, broken <abbr title="Cascading Style Sheets">CSS</abbr>
                support, and abandoned browsers.</p>
            <p>We must clear the mind of the past. Web enlightenment has been achieved thanks to the tireless efforts of
                folk like the <abbr title="World Wide Web Consortium">W3C</abbr>, <abbr title="Web Standards Project">WaSP</abbr>,
                and the major browser creators.</p>
            <p>The CSS Zen Garden invites you to relax and meditate on the important lessons of the masters. Begin to
                see with clarity. Learn to use the time-honored techniques in new and invigorating fashion. Become one
                with the web.</p>
        </div>
    </section>
    <div class="mian supporting" id="zen-supporting" role="main">
        <div class="explanation" id="zen-explanation" role="article">
            <h3>So What is This About?</h3>
            <p>There is a continuing need to show the power of <abbr title="Cascading Style Sheets">CSS</abbr>. The Zen
                Garden aims to excite, inspire, and encourage participation. To begin, view some of the existing designs
                in the list. Clicking on any one will load the style sheet into this very page. The <abbr
                        title="HyperText Markup Language">HTML</abbr> remains the same, the only thing that has changed
                is the external <abbr title="Cascading Style Sheets">CSS</abbr> file. Yes, really.</p>
            <p><abbr title="Cascading Style Sheets">CSS</abbr> allows complete and total control over the style of a
                hypertext document. The only way this can be illustrated in a way that gets people excited is by
                demonstrating what it can truly be, once the reins are placed in the hands of those able to create
                beauty from structure. Designers and coders alike have contributed to the beauty of the web; we can
                always push it further.</p>
        </div>

        <div class="participation" id="zen-participation" role="article">
            <h3>Participation</h3>
            <p>Strong visual design has always been our focus. You are modifying this page, so strong <abbr
                    title="Cascading Style Sheets">CSS</abbr> skills are necessary too, but the example files are
                commented well enough that even <abbr title="Cascading Style Sheets">CSS</abbr> novices can use them as
                starting points. Please see the <a href="http://www.mezzoblue.com/zengarden/resources/"
                                                   title="A listing of CSS-related resources"><abbr
                        title="Cascading Style Sheets">CSS</abbr> Resource Guide</a> for advanced tutorials and tips on
                working with <abbr title="Cascading Style Sheets">CSS</abbr>.</p>
            <p>You may modify the style sheet in any way you wish, but not the <abbr title="HyperText Markup Language">HTML</abbr>.
                This may seem daunting at first if you&#8217;ve never worked this way before, but follow the listed
                links to learn more, and use the sample files as a guide.</p>
            <p>Download the sample <a href="/examples/index" title="This page's source HTML code, not to be modified.">HTML</a>
                and <a href="/examples/style.css" title="This page's sample CSS, the file you may modify.">CSS</a> to
                work on a copy locally. Once you have completed your masterpiece (and please, don&#8217;t submit
                half-finished work) upload your <abbr title="Cascading Style Sheets">CSS</abbr> file to a web server
                under your control. <a href="http://www.mezzoblue.com/zengarden/submit/"
                                       title="Use the contact form to send us your CSS file">Send us a link</a> to an
                archive of that file and all associated assets, and if we choose to use it we will download it and place
                it on our server.</p>
        </div>

        <div class="benefits" id="zen-benefits" role="article">
            <h3>Benefits</h3>
            <p>Why participate? For recognition, inspiration, and a resource we can all refer to showing people how
                amazing <abbr title="Cascading Style Sheets">CSS</abbr> really can be. This site serves as equal parts
                inspiration for those working on the web today, learning tool for those who will be tomorrow, and
                gallery of future techniques we can all look forward to.</p>
        </div>

        <div class="requirements" id="zen-requirements" role="article">
            <h3>Requirements</h3>
            <p>Where possible, we would like to see mostly <abbr title="Cascading Style Sheets, levels 1 and 2">CSS 1
                &amp; 2</abbr> usage. <abbr title="Cascading Style Sheets, levels 3 and 4">CSS 3 &amp; 4</abbr> should
                be limited to widely-supported elements only, or strong fallbacks should be provided. The CSS Zen Garden
                is about functional, practical <abbr title="Cascading Style Sheets">CSS</abbr> and not the latest
                bleeding-edge tricks viewable by 2% of the browsing public. The only real requirement we have is that
                your <abbr title="Cascading Style Sheets">CSS</abbr> validates.</p>
            <p>Luckily, designing this way shows how well various browsers have implemented <abbr
                    title="Cascading Style Sheets">CSS</abbr> by now. When sticking to the guidelines you should see
                fairly consistent results across most modern browsers. Due to the sheer number of user agents on the web
                these days &#8212; especially when you factor in mobile &#8212; pixel-perfect layouts may not be
                possible across every platform. That&#8217;s okay, but do test in as many as you can. Your design should
                work in at least IE9+ and the latest Chrome, Firefox, iOS and Android browsers (run by over 90% of the
                population).</p>
            <p>We ask that you submit original artwork. Please respect copyright laws. Please keep objectionable
                material to a minimum, and try to incorporate unique and interesting visual themes to your work. We&#8217;re
                well past the point of needing another garden-related design.</p>
            <p>This is a learning exercise as well as a demonstration. You retain full copyright on your graphics (with
                limited exceptions, see <a href="http://www.mezzoblue.com/zengarden/submit/guidelines/">submission
                    guidelines</a>), but we ask you release your <abbr title="Cascading Style Sheets">CSS</abbr> under a
                Creative Commons license identical to the <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/"
                                                             title="View the Zen Garden's license information.">one on
                    this site</a> so that others may learn from your work.</p>
            <p role="contentinfo">By <a href="http://www.mezzoblue.com/">Dave Shea</a>. Bandwidth graciously donated by
                <a href="http://www.mediatemple.net/">mediatemple</a>. Now available: <a
                        href="http://www.amazon.com/exec/obidos/ASIN/0321303474/mezzoblue-20/">Zen Garden, the book</a>.
            </p>
        </div>
        <footer>
            <a href="http://validator.w3.org/check/referer" title="Check the validity of this site&#8217;s HTML"
               class="zen-validate-html">HTML</a>
            <a href="http://jigsaw.w3.org/css-validator/check/referer"
               title="Check the validity of this site&#8217;s CSS" class="zen-validate-css">CSS</a>
            <a href="http://creativecommons.org/licenses/by-nc-sa/3.0/"
               title="View the Creative Commons license of this site: Attribution-NonCommercial-ShareAlike."
               class="zen-license">CC</a>
            <a href="http://mezzoblue.com/zengarden/faq/#aaa" title="Read about the accessibility of this site"
               class="zen-accessibility">A11y</a>
            <a href="https://github.com/mezzoblue/csszengarden.com" title="Fork this site on Github" class="zen-github">GH</a>
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            <div class="design-selection" id="design-selection">
                <h3 class="select">Select a Design:</h3>
                <nav role="navigation">
                    <ul>
                        <li>
                            <a href="/221/" class="design-name">Mid Century Modern</a> by <a
                                href="http://andrewlohman.com/" class="designer-name">Andrew Lohman</a>
                        </li>
                        <li>
                            <a href="/220/" class="design-name">Garments</a> by <a href="http://danielmall.com/"
                                                                                   class="designer-name">Dan Mall</a>
                        </li>
                        <li>
                            <a href="/219/" class="design-name">Steel</a> by <a href="http://steffen-knoeller.de"
                                                                                class="designer-name">Steffen
                            Knoeller</a>
                        </li>
                        <li>
                            <a href="/218/" class="design-name">Apothecary</a> by <a href="http://trentwalton.com"
                                                                                     class="designer-name">Trent
                            Walton</a>
                        </li>
                        <li>
                            <a href="/217/" class="design-name">Screen Filler</a> by <a
                                href="http://elliotjaystocks.com/" class="designer-name">Elliot Jay Stocks</a>
                        </li>
                        <li>
                            <a href="/216/" class="design-name">Fountain Kiss</a> by <a href="http://jeremycarlson.com"
                                                                                        class="designer-name">Jeremy
                            Carlson</a>
                        </li>
                        <li>
                            <a href="/215/" class="design-name">A Robot Named Jimmy</a> by <a
                                href="http://meltmedia.com/" class="designer-name">meltmedia</a>
                        </li>
                        <li>
                            <a href="/214/" class="design-name">Verde Moderna</a> by <a href="http://www.mezzoblue.com/"
                                                                                        class="designer-name">Dave
                            Shea</a>
                        </li>
                    </ul>
                </nav>
            </div>

            <div class="design-archives" id="design-archives">
                <h3 class="archives">Archives:</h3>
                <nav role="navigation">
                    <ul>
                        <li class="next">
                            <a href="/214/page1">
                                Next Designs <span class="indicator">&rsaquo;</span>
                            </a>
                        </li>
                        <li class="viewall">
                            <a href="http://www.mezzoblue.com/zengarden/alldesigns/"
                               title="View every submission to the Zen Garden.">
                                View All Designs </a>
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                </nav>
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            <div class="zen-resources" id="zen-resources">
                <h3 class="resources">Resources:</h3>
                <ul>
                    <li class="view-css">
                        <a href="zen036.css" title="View the source CSS file of the currently-viewed design.">
                            View This Design&#8217;s <abbr title="Cascading Style Sheets">CSS</abbr> </a>
                    </li>
                    <li class="css-resources">
                        <a href="http://www.mezzoblue.com/zengarden/resources/"
                           title="Links to great sites with information on using CSS.">
                            <abbr title="Cascading Style Sheets">CSS</abbr> Resources </a>
                    </li>
                    <li class="zen-faq">
                        <a href="http://www.mezzoblue.com/zengarden/faq/"
                           title="A list of Frequently Asked Questions about the Zen Garden.">
                            <abbr title="Frequently Asked Questions">FAQ</abbr> </a>
                    </li>
                    <li class="zen-submit">
                        <a href="http://www.mezzoblue.com/zengarden/submit/" title="Send in your own CSS file.">
                            Submit a Design </a>
                    </li>
                    <li class="zen-translations">
                        <a href="http://www.mezzoblue.com/zengarden/translations/"
                           title="View translated versions of this page.">
                            Translations </a>
                    </li>
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